A comparison of three methods for the in situ determination of acoustic absorption coefficients

Authors

  • Scott Mallais Audio Research Group, Dept. of Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, ON N2L 3GI, Canada
  • John Vanderkooy Audio Research Group, Dept. of Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, ON N2L 3GI, Canada

Keywords:

Impulse response, Absorption coefficients, Acoustic absorption coefficients, In-situ, Reflected sounds, Resonant surfaces, Rigid surfaces, Thin sheet

Abstract

A study was conducted to compare three methods that were used to determine the absorption coefficient of a surface in situ. The first two methods included a reflection method and a subtraction technique to separate the incident and reflected sound waves of the impulse response. The third method utilized the first two measurements at a surface being investigated and at a rigid surface at the same location to calculate the absorption coefficient. A rigid surface was approximated by mounting a thin sheet against the surface being investigated. Two measurements were taken, including a measurement directly on the investigated surface and the second with an intervening reflective sheet. Three different surfaces were measured, including a resonant surface, an absorptive surface, and a rigid surface.

Published

2009-09-01

How to Cite

1.
Mallais S, Vanderkooy J. A comparison of three methods for the in situ determination of acoustic absorption coefficients. Canadian Acoustics [Internet]. 2009Sep.1 [cited 2021Apr.13];37(3):74-5. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2140

Issue

Section

Proceedings of the Acoustics Week in Canada